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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89df1995ba696b02b2d6c3ee8cd87d7a5dfebe41bcf2bc4e27aff737b4b1604b' 
  AND token = 'uF+dQsTYyvZ5HBNtaq3r3WhGtOT3sj8cm2h3og31qTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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