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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfaf6aa38fc3b8a1a2258b5e509d5fb7131c1506327c466cadad446da521d8c' 
  AND token = 'uCWk6SU+CBX2l3sxXNX2JNo1Q24ykbsxgerXZG22ILo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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