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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10f5096d7a97d44282c27629b7bf062dc877adce56c6086a51bb0e76a8a90db' 
  AND token = 'XCZ6DC3mDGABab4couXbB4T6UlWQtrggZRitICQKimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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