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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e734839290ce45380ff22f9a03b0e834727c03b4ec4ea64f5d1b34816ce7c611' 
  AND token = '6dyy3ZbytRGNPv9KnhjlJen5PK4dp/S4c80FFFmQofY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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