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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd467c5a624c2e2a1d99f7d517f0d6ab218125d3fbd5288a0a419d5c20b6618d2' 
  AND token = 'nSFDPm6vUj4i2u5Gb6a6L0d+6eSJXhO0HZ2Msq83628=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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