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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc40fa196da45dae116ee1947906c362a0305cc101d4e8edba334ecad7f3e1a2' 
  AND token = '/m266DmiDttSMziTm2rVwM25BWzEm7WUHPy02GZmOfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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