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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355b0bb75eba3f78a6015da873c76a47dd6bc2c92917fe0345eb86e73f76afa4' 
  AND token = 'cPr1CL7pI74KDYRpu/SH6UAO6bwtTHlw5tnITKaBLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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