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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2d0e949dafe341d46f9a234609d2edebbe101eb2d9c7e6b9659912365687f7' 
  AND token = 'f5XJ48r3N3CoY6j/2NFMybNah+qUHg8QsZniT4WR6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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