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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6f620b9d5bf3a927809bdd343ba8a5c1a79f0ce4b2e692d2d4bdd964622428' 
  AND token = 'Uh8npJvmCNywx2Y4j0mtWGDIdTF+Y9MF0kxyPsYxwVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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