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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ff62472ddd3e638a3854f3ede44250c99113d98aa53938fa4d1294b030828c' 
  AND token = 'uNX6zgAcgDq9W/CcfSrtpgT4Nz0O6JYSenwqdlHfGCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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