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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b71b178ef5f2325db855c7ee1a24f8875dfa9fe61745263af901cd1af2e870' 
  AND token = 'IBTWYMM7RkkbdDIFdVNRj4f80KQ6Yh+hBd3DX847atM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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