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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101144951a0bc67060c0a3b57df3a6a63246b1e1704d751529cfef89d89d4cf3' 
  AND token = 'epHvOYeAkXmmC8Fhuw46gbZ+eXMiSVRJK7TS15+1LI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}