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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44561f73acbab74e86a72479c3304e4d81adda87fa565cb6df4acc7a8e414ca' 
  AND token = 'vQswueixf0x1WIrhd50x9fxi/y02i/0q2D9WZJzfppE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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