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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5a90763018e40c5a5dce84618c025524f6ad6a7540ec8731c182d2c12bed9e' 
  AND token = 'Fm2qJREhTH/46gR2Bo17HDzfq5sk6xuslVBXwUMvkEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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