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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7571ed285ea78a1554e0d58479907048270226bbb06eee61fb72d599971d5b7f' 
  AND token = 'R5Ge+8d8N/VM08gXcj87xHIZfk8cRheuFkC3NDy56pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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