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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5f3185be152786f5df1f0523ef2a9c6d93ceb9f8038faab1a038acf51d6425' 
  AND token = 'C3HWcgvRWhGJHB+nW+Zd1vQh4UHi8Z3tX1b5g6Smnic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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