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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df3fd07983969c5a1c4e52d5c52c7cce14f0087ad576c179c8c3e1e7c24d74c' 
  AND token = 'bVAuNAnd0kFDXJ2LCclotvBmT43wbrWst1sViLbUk/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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