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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8a8e43e1eba75b07ff3b1183423050d9bb404cf197ee76399373db33801e4a' 
  AND token = 'e/Y989mhnNo74dt/riWR84QCaXPCrjV691Sa9X+AV68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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