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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b373e7bcfe693e1c16977fac6a6c8e9db10d7878313785017d02bb6a40c421' 
  AND token = 'BYUuI3jxNBIo0zWpl2NDrgSNWxwfU4Q19g1GX/ZVMZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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