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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62bd3fa96c0baa74c16fd4643c5d48f7ec0f7b11570f24ff96a9369e20ec8b3' 
  AND token = '4PActJoqAVbemnmwmfF+mfti53g9tjvw9HKZyB3K0E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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