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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093fa14fe3d5516eaf0d28e9485ff34ad93ef3fd2bb4f43f5154ba69fdb506cc' 
  AND token = '/NcKAnIUfE5E9eohgj6bl7SGp3khXBQtkW61FGoDx4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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