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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e691304a84851101e0f7e2571611c473f636cb089831aeee6cd1b0887b1ed06d' 
  AND token = 'HC3iEKnSV8iAuKChRT1/+1Kwl8VtA7r0iSd6sPknIMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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