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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ab1405c1243df4d1687b10e6d4073552e3a67f85e38677b8ebbbabf04cc5a5' 
  AND token = 'mp8t1Gb7+LCkyf18WoXhOBh2KwV3f7B0FGJeLrScVNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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