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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b74567d1631ee5a8cedab5a0675f32c9e277444c0058e9b88f210b47f2472c' 
  AND token = 'h9bGrHDiZkmEbInP+LCP4TydRz7bHbtku3+AL3LwTlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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