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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5a964b0aa87b293b744e98334f55a1880ff4474f2340a0401308a70f3d94ea' 
  AND token = 'gBDLL2KpSglJDRCVG0Rw88ekchwgEs2Ye6NUHkap8iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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