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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdf9848767e84c526331fc656f4e01dfa046b10e0e75b95b6299042b08f1b5c' 
  AND token = 'olD1J6vBHSxKB+rgNor7FlSvpI3k3pNk4iOW1WiY5IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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