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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73c08afd3336683537ce62c03f1cb550ae3f526bed008da65e39df03efe899e' 
  AND token = 'u/SYA+hnbJELiBVbeT64GlkHbiLsssrBXB2hyA5sZ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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