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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0932a1ccd908fe153fc51c080382e28de228a221c3990735612f4b05058ae15' 
  AND token = '+yvmoorNFk6PMueWeOTG2xm+G1MChC6nOAfgVLNwBm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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