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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e2a752035026bda5747a5ca81c1380cbcf46bd7f31976b18f745bbb98fab52' 
  AND token = 'IFhEg9HIZaw1gfQhCzzeGGN6Xm4yxt92uCsz5irlvis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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