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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dfd6a18f1617c86b3d4bd2a2399a8f688eb77c0b963ae8a37fd00a19342e9b' 
  AND token = 'i/UE50rXsW5TAQk/SdXpndsG/7mUlujbphTrzC9GN6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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