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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3a12a33cc98c38beae7f51547ae3bf64c4b2ba3f73ed5f02b82539997ecb91' 
  AND token = 'FwHF07AdIM6mQ4V+Ky8fABwYI0utIta+g9RereAjkAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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