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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87cd14f11ead6a059c26cc888054502ee52098f3c826c7947a252d598aa935b' 
  AND token = 'SMtRzrTa3wsEnMvKoGCWgLmxgCdiA+ClTo3oM2TMFuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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