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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc94ee00fa74b32891514e7c2be2cd31270dbe340d113a29af1b11d938aafc2' 
  AND token = 'KLeVhRTOqEb9N6O7NfEWLqJM8BiB69bJDxCtK80qsa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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