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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da36c05bced1a6886b8a1d543fbb1740185dae4e2d3e66005ca48644c8eb7b92' 
  AND token = 'E3yp6kP38nkV7LpQ29f3iPD2i/zQgG6Sswcds41XBR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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