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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fa2492aa23c7625fc781fcc8fba5131f65d735609fa4bb1295e3e3f093e6ab' 
  AND token = '+NM5XWnh7Cre6XriuA1yz8apVV8At7dQkiOYWnxBT8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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