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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756714428ab7e093546ccfd9bc77b35a0ce25e96c95181f87c072efe68e25c62' 
  AND token = 'Rw+s9b16gldxyjA68I+SVCotMcMCXcPgTpSmwG8CaAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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