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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510d2acce980ae475605fa50b1f6203747bbfbe331e4fb169aa79a86a4924146' 
  AND token = 'TeFo3R6TGX3b6hP4CHkFJGNtqV7kYsGHwczTjxQudsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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