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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c2e24af2a87199be390b728f0eedebef5a93e7ab7ece4bff375f748c302f82' 
  AND token = 'K632DJlKUtGeC1O0CcZ3jrObbNRNJx+EENHyTakc40Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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