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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71760429a7715fb37b6a2e0bccb4e1b2a3f784d6491ba9d66d1216a38890a865' 
  AND token = 'aZ49QdJgRbs+GSozIFXNrn81yMSWdQu7ijgdYATlaec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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