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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30604c5f92324576a52a325fb9c0d97889ba25ae3a6ec2b124341aaad0e60436' 
  AND token = 'w3/1eHcbsYPHv3eXARSVoUHNVpyRXXbhnCy3SBMiXx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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