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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a8fcf92c99de18c100fbed415ee04508d08ae95faa812240d53a7ef593647e' 
  AND token = 'yddAzJItN90AWCTcp4BZN39ozBck5EPmbw17cjL/Kws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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