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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a3eb51455d61aff0a96035335d10ac860e3185bd1bcb824f299a9fa30e4ce2' 
  AND token = '01W9BfSNJ0PoFoEI9PS8angLlI4TMLd3v/cb2O9n6wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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