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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a71934f09f4fabece59c00f80be9399e05e42d0167f9bd0c0d0af56bf8a2dca' 
  AND token = 'ecSb+M32DbE+CZ6VMHlXN2Gy2AKTpAgAEsKq9oTu2D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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