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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c68ca6d3a85d0c3786cf771dd3dd4b2d6d00ca668744e9fad47e05b5e06576d' 
  AND token = 'FLD1DU5VS36jQBXhVufF3RsiZrAONZfLozWAViFYHgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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