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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ead80dff0c7d78a4b78f1bb61ec8838d6fb5edbf3147b185471d486b42de58' 
  AND token = 'c+YerEaZ/HFAGHsno7v2XWFc7Me2lCQYDvSduWiGORQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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