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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe354922f2d11e21f3dbce8b6b3f170d493ad5e4bacc3731c6c065d3fe77db89' 
  AND token = 'FBSVanq34VL6FeG4YiRnm4PCashcqk+6HZrI+yekM3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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