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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d7a1f2ff983aa5ed9fe52125c8ca8e7b97c0591440857c9f693b461d654f2d' 
  AND token = 'LmODmYhPY+0OItWUSnyEF3gCW65HBheFg0681Rb0Fqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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